Book stand



FIG. 1 is a front perspective view of a book stand showing the new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is front view thereof; and,

FIG. 8 is a perspective view thereof in use.

The broken lines showing a book are included to show an article in the environment that forms no part of the claimed design. 

CLAIM The ornamental design for a book stand, as shown and described. 